/* clkhandler.c - clkhandler */

#include 

/*-----------------------------------------------------------------------
 * clkhandler - high level clock interrupt handler
 *-----------------------------------------------------------------------
 */
void    clkhandler()
{

        
        volatile struct am335x_timer1ms *csrptr =
                        (struct am335x_timer1ms *)0x44E31000;
                        /* Set csrptr to address of timer CSR       */

        /* If there is no interrupt, return */

        if((csrptr->tisr & AM335X_TIMER1MS_TISR_OVF_IT_FLAG) == 0) {
                return;
        }

        /* Acknowledge the interrupt */

        csrptr->tisr = AM335X_TIMER1MS_TISR_OVF_IT_FLAG;

        /* Increment 1000ms counter */

        count1000++;

        /* After 1 sec, increment clktime */

        if(count1000 >= 1000) {
                clktime++;
                count1000 = 0;
        }

        /* check if sleep queue is empty */

        if(!isempty(sleepq)) {

                /* sleepq nonempty, decrement the key of */
                /* topmost process on sleepq             */

                if((--queuetab[firstid(sleepq)].qkey) == 0) {

                        wakeup();
                }
        }

        /* Decrement the preemption counter */
        /* Reschedule if necessary          */

        if((--preempt) == 0) {
                preempt = QUANTUM;
                resched();
        }
}